Composition for grinding and polishing.



UNITED STATES PATENT oFFIoE.

composlrlon FOR Specification of Letters Patent.

GRINDING AND POLISHING- Patented Jan. 22, 1907.

Application filed March 21,1906- ri l- NO- 307,294.

To. all uihom 131? may concern.

Be it known that 1, CHARLES H; SNYDER, a

' citizen of the United States, residin at Baliron, and the like.

The object of the improved wheel ortool characterized particularly by extreme hardness and rapid-cut by freedom from ting qualities, by. porosity,

by cheapness of glaze, by durability, and construction.

The ingredients and pro ortions thereof used in making the compositlon for a' wheel or tool areas follows granulated .or pulverized rock, six parts; red lead, two parts; sodium silicate, one part; and sawdust, one part. The rock referred to may be selected from the hardest and most refractory minerals obtainable, although 'it may be stated that even when subjected to a high degree emery cannot be used because it will not stand the high temperature to which the composition is subjected, as hereinafter ex-' plained. .I use articularly aform of rock which so far as ,know can be found only in which is not at this time known to me, though I have been informed that it is a form of crystallized carbon, and I have applied thereto the name of carbonate rock. This rock is capable of being granulated and pul-" verized to many degrees of fineness, and it does not lose its granular or sharp nature of heat.

' It is therefore. particularlywell adapted for use as the basis of an abradmg tool.- The inventi'on, however, is not limited to this par ticularform of rock; but any mineral-or sub stance having similar qualities may be substituted. 1

g In making a wheel, for instance, the granuinvention is to form an one place and the chemical composition of al.

lated or pulverized rock of the desired degree of fineness is mixed with the other ingredients above mentioned to form a paste or plastic mass which can be molded. This is placed in a mold of desired shape and al lowed to dry for a few hours The'wheel is then burnt in a kiln raised to a temperature of 900 Celsius. The sodium silicate or water-glass is used merelyto make the composition plastic, so that it can be molded. The red lead is used as a binder. The sawdust is used to make the pores. The firing burns out the sawdust and the water-glass and leaves a hard wheel of gritty quality which will not glaze. If the mixin formed, the wheel'will be of uniform hardness throughout. The porous quality acquired from. burning out of the sawdust serves to prevent the wheel from glazing and has the further advantage that when used wet it will absorb and hold water. The saw dust is pulverized to a degree suitable for the kind ofw-heel being made. A coarse wheel that is, rock-req uires finer sawdust to produce the desired result, while a wheel of fine or. pulverized rock is best formed with coarser sawdust. A wheel formed'of the composition is a wheel having coarse granulated be well perpreferably supplied with 'a central core of metal or wood. I vAs a result of the high temperature to which it is subjected, the wheel becomes hard and non-breakable by speed and can be used either wet or dry and will not burn the work when used wet.

I claim An abradingsto ol formed of pulverized rock, red lead, sodium silicate and sawdust mixed together and subjected to heat sufii cient to burn out the sodium silicate and the sawdust. 7

In testimony name to thisspecification two subscribing witnesses.

CHARLES H. SNYDER;

whereof I have signed my Witnesses:

M. KUNsMan,

GEofE. Trimin the presenceof o 

